Inputs of the correlation process are a set of JPEG images and GPS data
encoded in GPX (GPS Exchange Format) format.

If GPS data are available at the precise moment the photo was taken
(with a 1-second granularity) the GPS data are stored unmodified in
EXIF fields. If they are not linear interpolation of GPS data
available at moments before and after the photo was taken can be used.

Both a command line tool (package gpscorrelate) and a GTK+ graphical
user interface for it (package gpscorrelate-gui) are provided.